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Harris Open Sci Ed Unit 7.1 Flashcards | StudBud
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Harris Open Sci Ed Unit 7.1
Harris Open Sci Ed Unit 7.1
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Answers
1
The type of matter made of just ONE kind of atom.
Matter
Reaction
Compound
Element
2
Is water a element or a compound?
Compound
element
3
In the image below what letter is pointing to the nucleus?
C
D
A
B
4
Boiling Water: Physical or Chemical Change
Chemical
Physical
5
Which property describes the ability of one substance to dissolve into another?
melting point
acidity
brittleness
solubility
6
Properties can change for a substance
True
False
7
In the law of conservation of mass, how does the mass of the products compare to the reactants?
the mass of the products is greater
the mass of the reactants is greater
the masses are always the same
8
What is the definition of "flammability" in science?
Describes a material that can disolve in a particular substance
A blend of two or more substances
Something made of one type of material throughout
How a substance interacts with fire
9
What two
property tests
have we run on our mystery bath bomb gas so far?
Independent and Dependent
density and flammability
flammability and texture
density and color
10
A material is __________ if it can be dissolved in something else.
Soluble
Solute
Solvent
Solubility
11
Less dense gases (and liquids) sink downward when surrounded by denser gases (and liquids)
False
True
12
A blend of two or more substances.
Reactant
Mixture
Substance
Soluble
13
According to Dalton's Atomic Theory, Chemical Reactions involve...
Trading valence electrons
Reorganization of the atoms
Atomic bonding
a big explosion
14
An example of a physical change would be:
Cutting paper
Cooking an egg
Melting ice cream
Rusting nail
15
What is the definition of "soluble" in science?
Something made of one type of material throughout
Describes a material that can disolve in a particular substance
Describes a material that does not dissolve in a particular substance
A blend of two or more substances
16
What is the coefficient in the chemical formula
1
8
2
4
17
What is a Chemical Reaction?
A process in which atoms and molecules change size and mass
The process in which an atom changes its shape
The process in which atoms rearrange to produce new substances
The process in which an atom changes it's substance
18
process of a solid breaking apart into particles too small to see and it mixes completely in the liquid
soluble
flammable
dissolve
insoluble
19
What is the definition of "property" in science?
A characteristic of a substance that doesn't change
How much matter in a certain space
A blend of two or more substances
Something made of one type of material throughout
20
In an open system, matter can get in or out, so the mass can change if that happens
False
True
21
What is difference between an element and a compound?
Ccompound is a pure substance while element is not.
They are the same.
Element is made of same atoms but compound is made of different elements.
None of the above.
22
Why is Helium NOT our bath bomb gas, even though it extinguishes a flame?
Because Helium is less dense than air and our mystery gas is MORE dense
Because flammability is the only property we can use to identify a gas.
Because it makes your voice sound funny.
23
Salt dissolving in water is an example of which type of property?
Chemical Property
Physical Property
24
Why is the law of conservation of mass true?
all atoms at start of reaction are there at end
the substances gain more atoms at the beginning of reaction
Some of molecules at the start of reaction are there at the end
25
our bath bomb gas is...
flammable
explosive
non-flammabe
26
What is the definition of "substance" in science?
Describes a material that can disolve in a particular substance
A blend of two or more substances
A characteristic of a substance that doesn't change no matter what size
Something made of one type of material throughout
27
made of one type of material throughout
heterogeneous
substance
homogeneous
mixture
28
A material able to dissolve other substances.
suspension
alloy
solute
solvent
29
What are reactants and which side of a chemical equation are they on?
Reactants are the ending material on the left side.
Reactants are the starting material on the left side.
Reactants are the ending material on the right side.
Reactants are the starting material on the right side.
30
Chemical reactions either require or release energy.
False
True
31
Helium is less dense than air.
True
False
32
What is the subscript on the reactant Oxygen, O?
4
3
2
1
33
19. Due to the Law of Conservation of Mass, the mass of the reactants must be ______ to the mass of the products.
greater than
equal to
unrelated
less than
34
What gas was being produced by the bath bomb?
carbon dioxide
argon
sodium citrate
nitrogen gas
35
Fill in the Blank: Matter has _____ and takes up space
Mass
Soluble
Space
Matter
36
the possible gases that are produced by our bath bomb are...
argon, nitrogen or carbon dioxide
methan, helium or oxygen
carbon dioxide, hydrogen
nitrogen, oxygen and helium
37
Fill in the Blank: Gases, liquids, and solids are all _______.
Mass
Soluble
Space
Matter
38
A subscript tells you what about an element?
the number of atoms of each element
the number of flowers you should plant
the number of elements in the equation
the number of atoms in the whole formula
39
a mixture that looks the same throughout
homogenous
heterogenous
pure substance
40
What is a chemical reaction?
A process in which a change to the physical properties of a material occurs
A process in which a substance is converted into a different substance
41
What is the number of protons that the element in this image contain?
131
77
54
42
What is the definition of "insoluble" in science?
Something made of one type of material throughout
Describes a material that can disolve in a particular substance
A blend of two or more substances
Describes a material that does not dissolve in a particular substance
43
What is the other PRODUCT created during the bath bomb chemical reaction and part of the left over liquid?
Sodium Acetate
Sodium Citrate
Citric Acid
Sodium Bicarbonate
44
Denser gases (and liquids) sink downward when surrounded by less dense gases (and liquids)
False
True
45
The reactants in a bath bomb chemical equation are Baking Soda, Water, and Citric Acid.
True
False
46
In the image below what letter is pointing to the electron?
d
b
c
a
47
Vinegar is mixed with baking soda in an open cup. After the bubbling the mass of the mixture will be
More than before
Less than before
There will be no mass
the same as before.
48
Does this equation follow the Law of Conservation of Mass?
No
True
49
In a closed system, no matter can get in or out, so the mass stays the same even when changes happen to the matter
True
False
50
What is the definition of "dissolve" in science?
When a solid breaks apart into particles too small to see in a liquid
Describes a material that can disolve in a particular substance
How a substance interacts with fire
Something made of one type of material throughout
51
Reactants are found on the ___________ side of the chemical equation.
Left
Right
52
A coefficient is...
The little numbers AFTER elements in a chemical equation.
The total number of atoms in the whole equation.
The big number BEFORE the elements in a chemical equation.
Something that works together well.
53
What is the definition of "density" in science?
How much matter in a certain space
Something made of one type of material throughout
How a substance interacts with fire
A blend of two or more substances
54
The gas from a bath bomb is less dense than air.
True
False
55
Which of the following results in a chemical change in matter?
burning wood
boiling water
bending a straw
breaking a pen
